CN101732946B - Production method for pressure-swing adsorption concentration of methane in gas - Google Patents
Production method for pressure-swing adsorption concentration of methane in gas Download PDFInfo
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- CN101732946B CN101732946B CN200910312874A CN200910312874A CN101732946B CN 101732946 B CN101732946 B CN 101732946B CN 200910312874 A CN200910312874 A CN 200910312874A CN 200910312874 A CN200910312874 A CN 200910312874A CN 101732946 B CN101732946 B CN 101732946B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 168
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 100
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 37
- 239000000463 material Substances 0.000 claims abstract description 27
- 239000003463 adsorbent Substances 0.000 claims abstract description 23
- 238000010521 absorption reaction Methods 0.000 claims description 75
- 238000012163 sequencing technique Methods 0.000 claims description 32
- 230000008569 process Effects 0.000 claims description 19
- 229910000838 Al alloy Inorganic materials 0.000 claims description 16
- 230000009466 transformation Effects 0.000 claims description 16
- 239000012141 concentrate Substances 0.000 claims description 15
- 238000000605 extraction Methods 0.000 claims description 15
- 238000007906 compression Methods 0.000 claims description 11
- 238000006073 displacement reaction Methods 0.000 claims description 11
- 230000006835 compression Effects 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000002808 molecular sieve Substances 0.000 claims description 7
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000000741 silica gel Substances 0.000 claims description 2
- 229910002027 silica gel Inorganic materials 0.000 claims description 2
- 238000004880 explosion Methods 0.000 abstract description 12
- 230000001629 suppression Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 118
- 238000005516 engineering process Methods 0.000 description 12
- 239000003245 coal Substances 0.000 description 11
- 239000000428 dust Substances 0.000 description 8
- 238000003825 pressing Methods 0.000 description 8
- 238000000926 separation method Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 5
- 238000000746 purification Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 238000013022 venting Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000000274 adsorptive effect Effects 0.000 description 4
- 241000282326 Felis catus Species 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 230000009183 running Effects 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000000994 depressogenic effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
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- 230000007613 environmental effect Effects 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
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Abstract
The invention relates to a method for the concentration of methane in a gas, in particular to a production method for the pressure-swing adsorption concentration of methane in the gas. The technical problem to be solved by the invention is to provide the production method for the pressure-swing adsorption concentration of the methane in the gas. In the method, adsorbents are filled into an adsorbing tower of a pressure-swing adsorption device and a buffer tank; an explosion suppression material the volume of which is 3-4 percent of the volume of the adsorbent is filled into the adsorbing tower of the pressure-swing adsorption device, and an explosion suppression material the volume of which is 1-2 percent of the volume of a pipeline is filled into the pipeline. The method can be used for the concentration of the gas containing 0.5-90 percent of methane, expands the application range of pressure-swing adsorption and improves the utilization quantity and the utilization rate of the gas.
Description
Technical field
The present invention relates to the production method of methane in the Device in Gas, particularly transformation absorption concentrates the safety in production method of methane in the Device in Gas.
Background technology
China is coal resources big countries, and the Device in Gas reserves are abundant, occupy the third place in the world, and 2000 meters of buried depths reach 31.46 tcms with interior Device in Gas stock number, and wherein, 1500 meters of buried depths are with interior 60% of the total resources that accounts for.At present, the Device in Gas that China discharges because of mining every year accounts for 30% of world's Device in Gas total emission volumn more than 130 billion cubic meters.The exploitation of Device in Gas not only can be alleviated the nervous contradiction of natural gas supply and demand, also can improve the safety production condition in colliery, increases clear energy sources, reduces atmosphere pollution, drives the development of related industry.Simultaneously, also be to realize that country is about one of important measures of " tap a new source of energy, realize that using energy source and environmental protection are synchronous, guarantee sustainable development " and guarantee Chinese energy safety.
The Device in Gas extraction is divided into ground exploitation and down-hole extraction; The former is the Device in Gas of extraction before mining, entrained air not, and methane concentration is more than the 9O%; Very little with conventional gas difference; Can directly use for reference ripe natural gas pretreating process and purify, feed natural-gas transfer pipeline or liquefaction then, use as high-grade energy or raw material.This method has obtained widespread usage at home and abroad, but certain requirement is arranged technically, and receives the influence of many-sided factors such as Device in Gas occurrence condition, exploitation geological conditions, and cost of investment is bigger; The latter has this layer extraction, adjacent layer extraction and goaf extraction mode, and methane content changes greatly, is generally 20～80%; As for mine ventilation gas, methane content is lower.
The Device in Gas of down-hole extraction entrained air in recovery process causes CH
4Content low and impurity is many, bring big difficulty for subsequent delivery and processing, so the Device in Gas of down-hole extraction is most of by use or emptying on the spot, the CH that is utilized on a small quantity generally speaking
4In, about 90% as the little domestic fuel of increment, seldom is used as other purposes.Because China's mine is numerous, geological condition is complicated, and the considerable part gas permeability of coal seam is relatively poor, and gas accounts for significant proportion in the Device in Gas of exploitation at present so the down-hole draws out methane, and therefore presses for to solve CH in the gas that draws out methane
4The thickening-purification technology problem, to improve its comprehensive utilization value.
CH in the Device in Gas
4Thickening-purification technology be meant N
2Or air and methane separation, make that methane content improves relatively in the Device in Gas, thereby can improve the calorific value and the remote value of carrying of Device in Gas.CH in the Device in Gas
4The thickening-purification technology technology comprise that mainly cryogenic separation, transformation adsorbing separation separate three kinds with film.Low temperature separating process, equipment investment is big, and only separative flow when big (millions of cubic meters every day) just have commercial value.Membrane separation technique is simple, is highly suitable for small-sized gas separating station, but up to now, still is in the research and development stage.The pressure swing adsorption technique technology has that technology is simple, facility compact, operating cost is low and characteristic of strong applicability, is mine gas gas individual well thickening-purification technology, concentrates and carry or the preferred approach of liquefaction, has guaranteed the delivery safety of Device in Gas.
Proposed among the Chinese patent CN85103557 to adopt pressure swing adsorption technique to concentrate the method for methane in the Device in Gas; It requires, and contained methane concentration must be lower than 5% in the waste gas that depressurization steps forward discharges; Generally be controlled at 0.1%～3%, to guarantee the security of operation process.The aerial explosion limit of methane is 5%～16%; So from Device in Gas, concentrating in the operating process of methane; Be difficult to both to have guaranteed methane concentration that product is high and high yield; Guarantee that again methane concentration like this, is restricted further applying of this technology less than 5% in the release waste gas.Chinese patent CN101099606, CN101096908 have proposed to adopt the method for methane in the pressure swing adsorption technique concentrating low-concentration Device in Gas, but do not propose the safe handling measure, and its result will receive and use restriction as patent CN85103557.
In the operation process of pressure-swing absorption apparatus; When adsorption tower is in adsorbed state; Methane in the Device in Gas is adsorbed agent absorption, makes methane minimizing in the Device in Gas, and oxygen concentration increases; And this process axially changes with adsorption time at adsorption tower, makes that Device in Gas is in explosion limit at any time in the adsorption tower.In pressure equalizing, the methane in the adsorption tower, in the pipeline in the Device in Gas also changes with the time of all pressing, and makes adsorption tower, pipeline Device in Gas be in explosion limit at any time.This is that the characteristics of pressure swing adsorption technique self determine, pressure swing adsorption is used for Device in Gas methane thickening-purification technology, and there is the danger of blast all the time in device.This also is that at present domestic and international pressure swing adsorption methane in coal mine mash gas concentrates the main cause that the field is restricted.
Abroad at CH
4/ N
2Mostly the adsorbent that separates is carbon molecular sieve (CMS), is primarily aimed at high concentration CH
4Casing-head gas (CH
4＞70%), through concentrating CH
4Can be higher than 90%; For intermediate concentration CH
4Rubbish landfill gas (CH
4About 60%), effect is preferably also arranged, and the commercialization instance is arranged.But the relevant report for the coal-bed gas gas PSA of low concentration (20%～50%) separates is then less, and the CH of low concentration coal-bed gas gas is described
4Carry densely, also exist bigger difficulty.
As previously mentioned; Concentrate in the process of methane in the Device in Gas in transformation absorption; In order to obtain concentration greater than 90% methane; No matter methane concentration is how little in the Device in Gas, adsorption tower and ducted methane and oxygen concentration all possibly reach the condition of gas explosion, as long as possess burning things which may cause a fire disaster simultaneously gas explosion accident will take place.On pressure-swing absorption apparatus, the factor that can produce burning things which may cause a fire disaster mainly be in the Device in Gas dust in compression process or the dust that produces of adsorbent abrasion in air-flow, produce fire by friction and the electrostatic accumulation spark.
If safe pressure swing adsorption can be provided, it is applied in concentrating of 0.1～90% methane in the coal mine mash gas, Device in Gas utilization and utilization rate will increase substantially, and economic results in society and environmental benefit are will ten minutes remarkable.
Summary of the invention
Technical problem to be solved by this invention provides the safety in production method that the absorption of a kind of transformation concentrates methane in the Device in Gas, and the Device in Gas that this method can be used for containing 0.5～90% methane concentrates, and improves Device in Gas utilization and utilization rate.
Technical scheme of the present invention is a filled with adsorbent in adsorption tower and the surge tank of pressure-swing absorption apparatus, the explosion-suppressing material of filled with adsorbent volume 3～4% in the adsorption tower of pressure-swing absorption apparatus and surge tank, the explosion-suppressing material of filling conduit volume 1～2% in the pipeline.Said explosion-suppressing material is preferably the aluminium alloy Web materials.
The datonation-inhibition mechanism of aluminum alloy explosion suppression material has following tripartite face: (1) aluminium alloy Web materials has good electrical conductivity; Air-flow, the dust ballistic factor that can prevent adsorbent, pipeline, valve in the adsorption tower produce static, thereby can avoid the blast accident by the static initiation; (2) cellular aluminium alloy net can be divided into many " cells " to adsorption tower, and these " cells " can be contained flame transmission, damp down a fire; (3) aluminum alloy honeycomb shape structure has very high specific area and fabulous heat absorption capacity in unit volume, and most heat absorption that can promptly burning be discharged are fallen, and it is little that pressure is increased.
Further, said adsorbent is at least a in silica gel, active carbon, 5A molecular sieve, 13X molecular sieve, the low si molecular sieves.
Said adsorbent intensity is high, good, the CH of wearability
4With N
2Separation can reduce dust greater than 3, the combustion explosion of avoiding device in running, to cause owing to adsorbent and dust, dust and air-flow, dust and pipeline valve friction generates electrostatic spark.
Further, adopt Device in Gas bolt special unit in the Device in Gas compressor of pressure-swing absorption apparatus, main frame adopts water spray cooling structure in the single-stage twin-screw in the said Device in Gas bolt special unit, and the gas inlet and outlet direction is to go out two stages of compression on enterprising.Because glassware for drinking water has cooling and datonation-inhibition effect, fricative high temperature of dust and screw rod and electrostatic spark have been avoided and the combustion explosion that causes.
For fear of the combustion explosion that valve causes owing to valve seat and spool friction generates electrostatic spark in switching process, pressure-swing absorption apparatus preferably adopts the special-purpose sequencing valve of Device in Gas pipeline.
Pressure-swing absorption apparatus can also be set up the chain control of the explosion-proof braking of the fire extinguishing system of pipeline, equipment, valve, as pressure, temperature, CO or the CO of any tower or pipeline
2During content generation alarm, system's Brake stop, the tower or the pipeline that take place to report to the police will start inner water injection system sprinkling fire.
Burst disk, burst disk burst pressure 0.8MPa are installed on adsorption tower and the pipeline; Adsorption tower, pipeline, valve, steelframe etc. are used copper wire UNICOM, and steelframe ground connection requires grounding resistance less than 10 Europe.
Compared with present technology, the inventive method has the following advantages:
1, solves pressure swing adsorption methane in coal mine mash gas and concentrated the safety in production problem that the field is restricted.
2, present technique is applicable to that methane concentration is that methane concentrates in 0.5～90% the transformation absorption coal mine mash gas, has enlarged the range of application of transformation absorption, improves Device in Gas utilization and utilization rate.
Description of drawings
Fig. 1 is the pressure swing adsorption technique flow chart that coal mine mash gas of the present invention concentrates methane, and A～E is an adsorption tower, the 1st, and Device in Gas; The 2nd, nitrogen, the 3rd, along venting and displacement gas, the 4th, remove the air of methane; The 5th, methane product, A1～8, B1～8, C1～8, D1～8, E1～8 are sequencing valve, and P1～5, P15～18, P33 are stop valve; K111～113, K15 are sequencing valve, and V1～4 are surge tank, and P101 is a vavuum pump.
Fig. 2 is the technology sequential chart of each adsorption tower, and A I is absorption, and A II is absorption, and D1 is that equal pressure drop is pressed, and D2 is that equal pressure drop is pressed, and P is suitable putting, and Z is the displacement of product gas, and V vacuumizes, and I isolates, and E2 is that equal voltage rise is pressed, and E1 is that equal voltage rise is pressed, and FR finally boosts.
The specific embodiment
The technological process that transformation absorption of the present invention concentrates methane in the Device in Gas can be selected according to methane content in the Device in Gas of institute's extraction; The general VPSA flow process that both can select several towers to adsorb simultaneously, repeatedly all press; The VPSA flow process of also can select two tower series adsorption, repeatedly all pressing is perhaps selected two-stage method VPSA flow process.
The VPSA flow process of be preferably two tower series adsorption, repeatedly all pressing.Its method is each adsorption tower will respectively carry out a series adsorption with two other tower in an adsorption cycle a method; Each adsorption tower adsorption process is that the logistics of absorption for the first time is the non-absorption phase materials of previous adsorption tower absorption; To tackle the easy absorption phase component of the trace that previous adsorption tower penetrates; The yield of separation process is guaranteed; The absorption second time is that feed product is directly passed through adsorption bed, and allows the easy absorption of part phase materials to penetrate this bed, and to make the logistics of easy absorption phase on adsorbent, reach absorption saturated as far as possible; Improve the utilization rate of adsorbent; Isolated easy absorption phase logistics content is fully guaranteed, and the non-absorption after absorption is done the feed stream of absorption for the first time to another adsorption tower mutually, each adsorption tower adsorb successively A I, absorption A II, all pressure drop press D, along put P, product gas displacement Z, vacuumize V, isolate I, all voltage rise pressure E, final the boost circulation step of FR.
Before Device in Gas gets into pressure swing adsorption system and concentrates, need through preliminary treatment: wherein Device in Gas adopt water ring vacuum pump as the extraction power-equipment from the mine extraction, water ring vacuum pump inlet be provided with the copper wire formula spark arrester and the leading portion backfire controller of series connection; The Device in Gas of extraction is through the liquid rotary pump pressurization, and the inlet of liquid rotary pump is equipped with special-purpose spark arrester of gas and backfire controller, and outlet conduit is equipped with aluminum alloy explosion suppression material and backfire controller.
Pressure-swing absorption apparatus is as shown in Figure 1, the VPSA flow process of adopt two tower series adsorption, all pressing for twice.The safety devices of pressure-swing absorption apparatus are realized through following measure:
1, Device in Gas bolt special compressor bank is selected in Device in Gas compression for use, and main frame adopts water spray cooling structure in the single-stage twin-screw in the Device in Gas bolt special compressor bank, and the gas inlet and outlet direction is to go out two stages of compression on enterprising.
2, adsorption tower has loaded acticarbon.
3, the netted explosion-suppressing material of aluminium alloy (FC-1) of filled with adsorbent volume 3% in adsorption tower and the surge tank.
4, the netted explosion-suppressing material of aluminium alloy (FC-1) of filling conduit volume 1% in the pipeline of pressure-swing absorption apparatus.
5, adopt the special-purpose sequencing valve of Device in Gas pipeline.
6, set up the chain control of the explosion-proof braking of the fire extinguishing system of pipeline, equipment, valve, as pressure, temperature, CO, the CO of any tower or pipeline
2During content generation alarm, system's Brake stop, the tower or the pipeline that take place to report to the police will start inner water injection system sprinkling fire.
7, burst disk, burst pressure 0.8MPa are installed on adsorption tower and the pipeline, adsorption tower, pipeline, valve, steelframe etc. are used copper wire UNICOM, and steelframe ground connection requires grounding resistance less than 10 Europe.
Pressure-swing absorption apparatus is replaced by 2 pairs of systems of inlet with the nitrogen that the battery limit (BL) is external after air purge, pressure testing are qualified, when the oxygen in the displacement gas during less than 2% (percent by volume) displacement qualified, device can put into operation.
The methane volume percent content that uses the external coal mine mash gas in battery limit (BL) is 30%, pressure is 10KPa, temperature normal temperature; Through Device in Gas bolt special compressor bank compression supercharging, the Device in Gas methane volume percent content of compression supercharging is 30%, pressure is 40 ℃ of 0.5MPa, temperature by inlet 1.The Device in Gas of compression supercharging gets into the pressure swing adsorption system of being made up of five adsorption towers of A～E.Being example with adsorption tower A below combines Fig. 1, Fig. 2 to explain to the technical process of methane recovery system:
1, absorption A I:
Device in Gas pressure 0.5Mpa through the liquid rotary pump compression; Through the bottom inflow of sequencing valve E1 from adsorption tower E; This moment, adsorption tower E was in absorption AII state; The dry gas that contains methane that comes out from adsorption tower E top gets at the bottom of the adsorption tower A that accomplishes the FR that finally boosts through sequencing valve E7, A8; Adsorption column pressure is controlled at 0.5Mpa, and the methane in the Device in Gas is selected and is adsorbed on the special-purpose methane adsorbent, and other components conducts not adsorbed gas are discharged into surge tank V4 emptying from the absorption cat head through sequencing valve A4, P18.This step has realized the absorption again of methane, has improved the rate of recovery of methane, makes separating fully of methane and other components.When the volumetric concentration of methane in the adsorption tower A discharge gas reaches 0.5%, close sequencing valve A4, E1, E7, A8, adsorption step A I finishes.
2, absorption A II:
Device in Gas pressure 0.5Mpa through the liquid rotary pump compression; Through the bottom inflow of sequencing valve A1 from adsorption tower A; Adsorption column pressure is controlled at 0.5Mpa; Methane in the Device in Gas is selected and is adsorbed on the special-purpose methane adsorbent; Other components conducts not adsorbed gas are adsorbed through the adsorption tower B that A7, B8 discharge entering are in absorption A I state from the absorption cat head again, and adsorbed gas is not discharged into surge tank V4 emptying from adsorbing cat head through sequencing valve B4, P18, and the methane content in the adsorbed gas is not controlled at 4% (percent by volume).This step allows part methane to penetrate the adsorption tower bed, and to make methane on adsorbent, reach absorption saturated as far as possible, improves the utilization rate of adsorbent, makes that methane content is fully guaranteed in the isolated product gas.When absorption finishes, close A1, B4, A7, A8 sequencing valve.
3, all D1 is pressed in pressure drop:
After absorption AII step finishes, open sequencing valve A5, K112, P16, adsorption tower A and surge tank V3 all are depressed into two pressure tower balances.After all pressing end, close A5, K112 sequencing valve
4, all D2 is pressed in pressure drop:
After all pressure drop D1 finishes, open sequencing valve A6, D6, adsorption tower A and adsorption tower D all are depressed into two pressure tower balances.After all pressing end, close A6, D6 sequencing valve.
5, along putting P:
After all pressure drop D2 finishes, open sequencing valve A6, K111, P15, gas in the adsorption tower A along the step-down of absorption direction, when the tower internal pressure is reduced to 0.02Mpa, is closed the K111 sequencing valve.Get into its recovery system along venting, after pressurizeing as the unstripped gas reuse.
6, product gas displacement Z:
After putting the P end, open sequencing valve A2, A6, K111, P15, close K115, displacement gas gets into adsorption tower A from A2, replaces along the absorption direction, displaces implication and flows out through A 6, K111, P15.To displace in the implication methane concentration higher as adsorption tower A, gets into its recovery system, after pressurization as the unstripped gas reuse.After the replacement completion, close sequencing valve A2, A6, K111, open K115.
7, vacuumize V:
After the product gas replacement completion, open sequencing valve A3, K115, P33, extract out by vavuum pump P101 through surge tank V2.After vacuumizing end, close sequencing valve A3.
8, isolate I:
After vacuumizing end, sequencing valve A1～A8 of adsorption tower A all is in closed condition, waits for and carries out next step.
9, all E2 is pressed in voltage rise:
After isolating the I end, open sequencing valve A6, C6, the gas that utilizes the equal pressure drop D2 of adsorption tower C to discharge boosts to accomplishing the adsorption tower that vacuumizes, to two pressure tower balances.After all pressing end, close A6, C6 sequencing valve.
10, all E1 is pressed in voltage rise:
After all voltage rise E2 finishes, open sequencing valve A5, K112, utilize gas and adsorption tower A among the surge tank V3 to boost, to two pressure tower balances.After all pressing end, close A5, K112 sequencing valve.
11, the FR that finally boosts:
After all voltage rise E1 finishes, open sequencing valve A5, K113, P17, utilize the gas among the surge tank V4 that adsorption tower A is boosted,, close A5, K113 sequencing valve when adsorption column pressure during near adsorptive pressure.
After accomplishing above-mentioned steps, adsorption tower A has accomplished the cycling of one-period.The circulation step of other four adsorption tower B～E as shown in Figure 2 and adsorption tower A are identical; Staggering each other in time just; There is an adsorption tower adsorbing A I procedure at any time with assurance, thereby guarantees the continuous operation of methane adsorbent equipment.
So far, the technical process of present embodiment is all over.Present embodiment can obtain the about 85v% methane gas of methane content, and the methane yield is about 99%, outlet 3 discharge along venting with displacement gas circulation reclaim the about 0.5v% of gases methane content of outlet 4 discharges.Whole system safety does not detect CO, CO
2Content is constant.
The methane content of the coal mine mash gas of present embodiment is 50%, and adsorptive pressure is 1.0MPa, 40 ℃ of adsorption temps.This pressure-swing absorption apparatus adopts the safety devices setting of embodiment 1.Adsorption tower has loaded 3% the netted explosion-suppressing material of aluminium alloy (FC-1) of adsorbent volume, and pipeline has been adorned the netted explosion-suppressing material of aluminium alloy (FC-1) of conduit volume 1%.Implement according to the processing step of embodiment 1 then.
Present embodiment can obtain about 95% gas of methane content, and the methane yield is about 99%, outlet 3 discharge along venting with displacement gas circulation reclaim the about 0.5v% of gases methane content of outlet 4 discharges.Security of system does not detect CO, CO
2Content is constant.
The methane content of the coal mine mash gas of present embodiment is 10%, adsorptive pressure 0.3MPa, 40 ℃ of adsorption temps. this pressure-swing absorption apparatus adopts the safety devices setting of embodiment 1.Adsorption tower has loaded 4% the netted explosion-suppressing material of aluminium alloy (FC-1) of adsorbent volume, and pipeline has been adorned the netted explosion-suppressing material of aluminium alloy (FC-1) of conduit volume 2%.Implement according to the processing step of embodiment 1 then.
It is 65% gas that present embodiment can obtain methane content, and the methane yield is about 95%, outlet 3 discharge along venting with displacement gas circulation reclaim the about 0.5v% of gases methane content of outlet 4 discharges.Security of system does not detect CO, CO
2Content is constant.
Comparative Examples 1
The methane content of the coal mine mash gas of present embodiment is 10%, adsorptive pressure 0.3MPa, 40 ℃ of adsorption temps.This pressure-swing absorption apparatus does not adopt safety devices of the present invention to carry out.Implement as follows: implement by the processing step of present embodiment 1 again.
1, Device in Gas bolt special unit is selected in the Device in Gas compression for use.
2, adsorption tower has loaded acticarbon.
3, the dress netted explosion-suppressing material of aluminium alloy (FC-1) (consumption is with embodiment 1) in the pipeline that is connected with special-purpose sequencing valve A1-E1 of Device in Gas bolt special unit and the surge tank, remaining pipes and surge tank are not adorned explosion-suppressing material.
4, adopt the special-purpose sequencing valve of Device in Gas pipeline.
5, on adsorption tower and the pipeline burst disk is installed, burst pressure 0.8MPa.
Implement by the processing step of present embodiment 1 again.
Present embodiment in running, when adsorption tower A in equal pressure drop D2 runnings, the pipeline that sequencing valve A6 is connected with K112 is blasted, burst disk is torn.
Explained that the netted explosion-suppressing material of dress aluminium alloy can be avoided the blast accident by the static initiation, safeguards system safety in pipeline and the surge tank.
Claims (8)
1. transformation absorption concentrates the production method of methane in the Device in Gas; Filled with adsorbent in the adsorption tower of pressure-swing absorption apparatus and the surge tank; It is characterized in that: the explosion-suppressing material of filled with adsorbent volume 3～4% in the adsorption tower of pressure-swing absorption apparatus, the explosion-suppressing material of filling conduit volume 1～2% in the pipeline; Said explosion-suppressing material is the aluminium alloy Web materials; Said adsorbent is at least a in silica gel, active carbon, 5A molecular sieve, 13X molecular sieve, the low si molecular sieves.
2. adsorb the production method that concentrates methane in the Device in Gas according to the said transformation of claim 1; It is characterized in that: adopt Device in Gas bolt special unit in the Device in Gas compressor of pressure-swing absorption apparatus; Main frame adopts water spray cooling structure in the single-stage twin-screw in the said Device in Gas bolt special unit, and the gas inlet and outlet direction is to go out two stages of compression on enterprising.
3. according to the production method of methane in the concentrated Device in Gas of the said transformation absorption of claim 1, it is characterized in that: pressure-swing absorption apparatus adopts the special-purpose sequencing valve of Device in Gas pipeline.
4. according to the production method of methane in the concentrated Device in Gas of the said transformation absorption of claim 1, it is characterized in that: pressure-swing absorption apparatus is set up the chain control of the explosion-proof braking of the fire extinguishing system of pipeline, equipment, valve.
5. according to the production method of methane in the concentrated Device in Gas of the said transformation absorption of claim 1, it is characterized in that: on adsorption tower and the pipeline burst disk is installed; Adsorption tower, pipeline, valve and steelframe are used copper wire UNICOM, steelframe ground connection, and grounding resistance is less than 10 Europe.
6. according to the production method of methane in the concentrated Device in Gas of each said transformation absorption of claim 1～5, it is characterized in that: before Device in Gas gets into pressure-swing absorption apparatus, through preliminary treatment; Said preliminary treatment for water ring vacuum pump as the extraction power-equipment from the mine extraction, the Device in Gas of extraction is through liquid rotary pump pressurization back entering pressure-swing absorption apparatus.
7. according to the production method of methane in the concentrated Device in Gas of the said transformation absorption of claim 6, it is characterized in that: the inlet of water ring vacuum pump is provided with the copper wire formula spark arrester and the leading portion backfire controller of series connection; The inlet of liquid rotary pump is provided with special-purpose spark arrester of gas and backfire controller, and outlet conduit is provided with aluminium alloy Web materials and backfire controller.
8. each said transformation absorption concentrates the production method of methane in the Device in Gas according to claim 1～5, it is characterized in that: the VPSA flow process that said pressure-swing absorption apparatus is two tower series adsorption, repeatedly all press; Be specially each adsorption tower and in an adsorption cycle, respectively carry out series adsorption one time with two other tower; Each adsorption tower adsorption process is that the logistics of absorption for the first time is the non-absorption phase materials of previous adsorption tower absorption; Absorption is that feed product is directly passed through adsorption bed for the second time; And allow the easy absorption of part phase materials to penetrate this bed; Non-absorption after absorption is done the feed stream of absorption for the first time to another adsorption tower mutually, each adsorption tower adsorb successively A I, absorption A II, all pressure drop press D, along put P, product gas displacement Z, vacuumize V, isolate I, all voltage rise pressure E, final the boost circulation step of FR.
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| CN102600699B (en) * | 2012-04-13 | 2014-08-27 | 长兴山立化工材料科技有限公司 | Pressure-variable adsorption gas separation device |
| CN102698563B (en) * | 2012-06-11 | 2014-07-09 | 四川亚连科技有限责任公司 | High purity and high recovery rate methane concentration production process and implementing device thereof |
| CN103205297A (en) * | 2013-04-15 | 2013-07-17 | 西南化工研究设计院有限公司 | Method for separating and purifying coal mine methane (CMM) in mine areas by using pressure swing adsorption (PSA) process |
| CN103316630B (en) * | 2013-06-19 | 2015-12-02 | 王朝晖 | A kind of porous natural gas adsorbent and preparation method thereof and application |
| CN103695063B (en) * | 2013-12-25 | 2015-04-22 | 四川省达科特能源科技有限公司 | Method for concentrating low-concentration methane gas |
| CN103861422B (en) * | 2014-02-13 | 2016-03-23 | 四川省达科特能源科技股份有限公司 | A kind of concentrate is containing the new process of methane in oxygen coal-bed gas gas |
| CN105233624B (en) * | 2015-10-21 | 2018-03-02 | 中国石油化工股份有限公司 | A kind of organic gas processing unit and its application method based on absorption with pressure |
| CN108619859B (en) * | 2018-04-26 | 2020-10-16 | 中国舰船研究设计中心 | Coupling type pressure swing adsorption gas production system and method |
| CN110354637B (en) * | 2019-07-30 | 2021-12-10 | 盖氏科技 | Method for enriching easily-adsorbed gas by pressure swing adsorption method |
| CN112742170B (en) * | 2019-10-31 | 2023-04-07 | 中国石油化工股份有限公司 | Method for purifying high-nitrogen-content energy gas |
| CN111773882B (en) * | 2020-07-28 | 2021-08-20 | 中国矿业大学 | Micro-positive pressure vacuum pressure swing adsorption system and method for safely concentrating low-concentration gas |
| CN113426245B (en) * | 2021-07-05 | 2022-11-22 | 四川炳辉环保科技有限责任公司 | High-purity gas preparation method based on pressure swing adsorption |
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